Are your aluminium rims very dirty? You can avoid this problem by washing the rims regularly with car shampoo. But if it’s too late for that, you have a problem that you can solve by reading this article.
When washing your car you should first wash and rinse the rims. Then use the cleaning fluid Aluminium Teufel (the best cleaning fluid for rims), which you can dilute with water. Rub the rims with a sponge, wash them thoroughly and wipe with a cloth. The rims still aren’t entirely clean? If you have any polish at home, apply some on a cloth and polish the rims. Then take a dry cloth and remove the polish from the rims. Wait for a while and then wash the rims again, preferably using only water. If the rims still aren’t clean, the only thing that remains is to sand and paint them, but it can be very expensive (100-150€ for 4 rims). Sanding and painting is also a solution if your rims are damaged or if the paint is peeling.
That is why you shouldn’t forget to rub the rims with a sponge every time you wash your car (use two different sponges for washing the rims and for the whole car), as it helps to remove the dirt that eats into the rims. If both your summer and winter tyres have attached rims, you should clean the rims and the tyres before you store them. You can read more it in the article storing tyres, where you can also read about where and how to store the tyres in winter and in summer, so they don’t deteriorate too quickly. Have a nice day!